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{{CMG}}; {{AE}} {{ADI}}
 
{{CMG}}; {{AE}} {{YD}}; {{SSK}}; {{ADI}}; {{LRO}}
{{Pertussis}}
{{Pertussis}}
==Overview==
==Overview==
Pertussis must be differentiated from other causes of cough, dyspnea, and coryza, such as [[asthma]], [[pneumonia]], [[bronchiolitis]], [[croup]], [[common cold]], [[cystic fibrosis]], [[foreign body aspiration]], [[gastroesophageal reflux disease]], and [[sinusitis]].
==Differentiating Pertussis from other diseases==
*Pertusis must be differentiated from other respiratory and cardiac diseases that can cause the same clinical manifestations like [[cough]] and [[dyspnea]]. These diseases include [[bronchiolitis]], [[COPD]], [[pneumonia]], [[congestive heart failure]], diffuse idiopathic neuroendocrine cell hyperplasia, [[tuberculosis]], [[asthma]], [[foreign body aspiration]], [[pulmonary embolism]] and [[Interstitial Pneumonia|Harmann-Rich syndrome]].<ref name="pmid27180590">{{cite journal| author=Liu WY, Yu Q, Yue HM, Zhang JB, Li L, Wang XY et al.| title=[The distribution characteristics of etiology of chronic cough in Lanzhou]. | journal=Zhonghua Jie He He Hu Xi Za Zhi | year= 2016 | volume= 39 | issue= 5 | pages= 362-7 | pmid=27180590 | doi=10.3760/cma.j.issn.1001-0939.2016.05.006 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=27180590  }} </ref><ref name="pmid28452705">{{cite journal| author=Lin L, Chen Z, Cao Y, Sun G| title=Normal saline solution nasal-pharyngeal irrigation improves chronic cough associated with allergic rhinitis. | journal=Am J Rhinol Allergy | year= 2017 | volume= 31 | issue= 2 | pages= 96-104 | pmid=28452705 | doi=10.2500/ajra.2017.31.4418 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=28452705  }} </ref><ref name="pmid28454456">{{cite journal| author=Jiang S, Li J, Zeng Q, Liang J| title=Pulmonary artery intimal sarcoma misdiagnosed as pulmonary embolism: A case report. | journal=Oncol Lett | year= 2017 | volume= 13 | issue= 4 | pages= 2713-2716 | pmid=28454456 | doi=10.3892/ol.2017.5775 | pmc=5403205 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=28454456  }} </ref><ref name="pmid26169577">{{cite journal| author=Mosley JD, Shaffer CM, Van Driest SL, Weeke PE, Wells QS, Karnes JH et al.| title=A genome-wide association study identifies variants in KCNIP4 associated with ACE inhibitor-induced cough. | journal=Pharmacogenomics J | year= 2016 | volume= 16 | issue= 3 | pages= 231-7 | pmid=26169577 | doi=10.1038/tpj.2015.51 | pmc=4713364 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26169577  }} </ref><ref name="cdc">Environmental Triggers of Asthma. Differential Diagnosis of Asthma. Environmental Health and Medicine Education. Agency for Toxic Substances and Disease Registry. Available at: http://www.atsdr.cdc.gov/csem/csem.asp?csem=32&po=5. Accessed on February 25, 2016</ref>


==Differentiating Pertussis from other Diseases==
{| class="wikitable"
Pertussis presents with cough and catarrh which may be seen in many other conditions like
! rowspan="2" |Diseases
* [[Common cold]]
! colspan="2" |Symptoms
* [[Bronchiolitis]]
!
* [[Chlamydia]]l infections
! colspan="3" |Signs
* [[Atypical pneumonia]]
! colspan="2" |Diagosis
|-
!Fever
!Cough
!Chest pain
!Wheezes
!Crackles
!Tachycardia
!Lab tests
!Imaging
|-
|[[Pertussis]]
| +
|Dry
|
| -
| -
| -
|
* Nasopharyngeal swab for [[Polymerase chain reaction|PCR testing]]
* [[Sputum culture]]
* Serology to detect [[pertussis toxin]]<ref name="CDC4">[http://www.cdc.gov/pertussis/clinical/diagnostic-testing/diagnosis-confirmation.html Pertussis (whooping coug). Diagnosis confirmation. CDC.gov. Accessed on June 22, 2017]</ref><ref name="CDC3">[http://www.cdc.gov/pertussis/clinical/diagnostic-testing/specimen-collection.html Pertussis (whooping cough). Specimen collection. CDC.gov. Accessed on June 22, 2017] </ref>
|
* No remarkable imaging findings
|-
|[[Asthma]]
|<nowiki>-</nowiki>
|Dry/Productive
| -
|<nowiki>+</nowiki>
| -
| -
|
* Lab tests to exclude other [[Disease|diseases]]
* Serum examination shows elevated level of [[Eosinophil|eosinophils]] due to [[allergy]] 
|
* [[CT scan]] shows:
** Dilated [[bronchi]]
** Bronchial wall thickening
** Air trapping
|-
|[[Bronchiolitis]]
| +/-
|Dry
|<nowiki>-</nowiki>
|<nowiki>+</nowiki>
| +
| +/-
|
* [[ELISA]] and [[immunoassays]] may be done in case of [[RSV]] [[infection]]
* [[Pulmonary function test]] to exclude other [[lung diseases]]<ref name="pmid18339530">{{cite journal| author=Ghanei M, Tazelaar HD, Chilosi M, Harandi AA, Peyman M, Akbari HM et al.| title=An international collaborative pathologic study of surgical lung biopsies from mustard gas-exposed patients. | journal=Respir Med | year= 2008 | volume= 102 | issue= 6 | pages= 825-30 | pmid=18339530 | doi=10.1016/j.rmed.2008.01.016 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=18339530  }} </ref>
|
* [[CT scan]] shows:
** Intense [[Bronchiolar epithelium|bronchiolar]] mural [[inflammation]] 
** [[bronchial]] wall thickening
** Centrilobular [[nodules]] with tree-in-bud pattern 
|-
|[[COPD]]
|<nowiki>+</nowiki>
|Productive
|<nowiki>-</nowiki>
| +
| +
| +
|
* [[Spirometry]]: [[FEV1/FVC ratio|FEV1/FVC]] < 70%
* Arterial blood gases: [[hypoxemia]] and [[hypercapnia]]
* [[Sputum culture]] 
|
* EKG may show:
** [[P pulmonale]]
** [[right ventricular hypertrophy]]
** Narrow QRS<ref name="pmid23653989">{{cite journal| author=Lazović B, Svenda MZ, Mazić S, Stajić Z, Delić M| title=Analysis of electrocardiogram in chronic obstructive pulmonary disease patients. | journal=Med Pregl | year= 2013 | volume= 66 | issue= 3-4 | pages= 126-9 | pmid=23653989 | doi= | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23653989  }} </ref>
* CT scan is more sensitive in diagnosing COPD than X ray 
|-
|[[Bacterial pneumonia]]
|<nowiki>+</nowiki>
|Productive
| +
| +
| +
| +/-
|
* Diagnosis depends on presentation and physical examination
* Laboratory tests
** [[arterial blood gases]] may show [[hypoxia]] and [[acidosis]]
** [[Sputum culture]]
|
* X ray is performed to detect:
** [[pleural effusion]]
** Inflitrates within the [[lungs]].
* CT scan shows:
** [[Consolidation (medicine)|Consolidation]]
** Ground glass appearance
|-
|[[Pulmonary embolism]]
| +/-
|Bloody
| +
| +
| +
| +
|
* Arterial blood gases may show:<ref name="pmid2491801">{{cite journal |author=Cvitanic O, Marino PL |title=Improved use of arterial blood gas analysis in suspected pulmonary embolism |journal=[[Chest]] |volume=95 |issue=1 |pages=48–51 |year=1989 |month=January |pmid=2491801 |doi= |url=http://www.chestjournal.org/cgi/pmidlookup?view=long&pmid=2491801 |accessdate=2012-04-30}}</ref>
**[[Hypoxemia]]
**[[Hypocapnia]]
**[[Respiratory alkalosis]]
**Increased alveolar-arterial gradient
*[[D-dimer]] assay to rule out other diseases like [[DVT]]
* [[Hypercoagulability]] tests for patients with:
** Unprovoked [[venous thrombosis]] at an early age (< 40 years)
** Family history of [[VTE]] syndromes
*Routine blood tests are non specific
|
* CT [[pulmonary angiography]] is the gold standard imaging to diagnose pulmonary embolism. CT may show:
**Acute:Centrally located [[thrombus]] occluding the vessel
**Chronic:Eccentric changes in the [[vessel wall]], recanalization in the thrombous and arterial web
* EKG is not specific or sensitive in PE diagnosis but it may show:
** [[T wave inversion]]
** [[P pulmonale]]
** [[sinus tachycardia]]
* Chest X ray to exclude other differentials
|-
|Diffuse idiopathic pulmonary neuroendocrine cell hyperplasia<ref name="pmid21471097">{{cite journal| author=Nassar AA, Jaroszewski DE, Helmers RA, Colby TV, Patel BM, Mookadam F| title=Diffuse idiopathic pulmonary neuroendocrine cell hyperplasia: a systematic overview. | journal=Am J Respir Crit Care Med | year= 2011 | volume= 184 | issue= 1 | pages= 8-16 | pmid=21471097 | doi=10.1164/rccm.201010-1685PP | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21471097  }} </ref>
| -
|Dry
| -
| +
| -
| -
|
* Pulmonary function test shows obstructive lung disease
|
* CT scan may show:
** Multiple [[nodules]]
** [[Ground glass opacification on CT|Ground glass]] appearance
** [[Bronchiectasis]].
|-
|[[Tuberculosis]]
| +
|Bloody
| +
| -
| -
| -
|
* Sputum culture:
** Three successive positive culture for [[Mycobacterium tuberculosis|M. tuberculosis]] confirms the diagnosis<ref name="pmid12614730">{{cite journal |author=Drobniewski F, Caws M, Gibson A, Young D |title=Modern laboratory diagnosis of tuberculosis |journal=Lancet Infect Dis |volume=3 |issue=3 |pages=141-7 |year=2003 |id=PMID 12614730}}</ref>
** Presence of acid fast bacilli in sputum smear indicates high extent tuberculosis
|
* Chest X ray is an important diagnostic imaging procedure in TB diagnosis. X ray may show:<ref>{{Cite journal
| author = [[Riccardo Piccazzo]], [[Francesco Paparo]] & [[Giacomo Garlaschi]]
| title = Diagnostic accuracy of chest radiography for the diagnosis of tuberculosis (TB) and its role in the detection of latent TB infection: a systematic review
| journal = [[The Journal of rheumatology. Supplement]]
| volume = 91
| pages = 32–40
| year = 2014
| month = May
| doi = 10.3899/jrheum.140100
| pmid = 24788998
}}</ref>
** Parenchymal infilration
** Hilar [[adenopathy]]
**[[Nodules]]  
**[[Pleural effusion (patient information)|Pleural effusion]]


'''Differentiating features'''
* CT scan may show:<ref>{{Cite journal
* History of [[vaccination]]
| author = [[Jeong Min Ko]], [[Hyun Jin Park]] & [[Chi Hong Kim]]
* History of prolonged [[cough ]]
| title = Pulmonary Changes of Pleural Tuberculosis: Up-to-Date CT Imaging
* Chest X ray to differentiate [[pneumonia]]
| journal = [[Chest]]
| year = 2014
| month = June
| doi = 10.1378/chest.14-0196
| pmid = 25086249
}}</ref>
** Micronodules
** [[Cavitation]]
** [[Consolidation (medicine)|Consolidation]]
**Interlobular septal thickening
*EKG may have abnormalities in case pleural effussion associated with TB.
 
|-
|[[Hamman-Rich syndrome|Interstitial pneumonitis]] (Hamman - Rich syndrome)
|<nowiki>+</nowiki>
|Productive
| -
| -
| +
| -
|
* Arterial blood gases may show:
** [[hypoxemia]]
** PaO2/FiO2 less than 200 mmHg indicating [[acute respiratory distress syndrome]]
* Other lab tests are done to exclude other diseases
|
* Chest X ray may show:
** Bilateral airway opacification
* CT scan may show
** [[Ground glass opacification on CT|Ground glass]] appearance.
* [[Bronchoscopy]] to exclude other causes such as:
** [[alveolar]] [[hemorrhage]]
** [[lymphoma]].
* Lung biopsy is done:
** In unclear cases; to confirm [[Interstitial pneumonitis|acute interstitial pneumonitis]]
** Exclude other causes of [[Acute respiratory distress syndrome|ARDS]]
|-
|[[Foreign body aspiration]]
| +
|Bloody
|<nowiki>+</nowiki>
| +
| -
| -
|
* Lab tests to evaluate the [[ventilation]] function
|
* Chest X ray shows:
** Hyperinflation
** Mediastinal shift 
** [[atelectasis|Aatelectasis]]
|-
|[[Congestive heart failure]]
| -
|Dry/Productive
|<nowiki>+ while walking </nowiki>
| -
| -
| +
|
*Routine lab tests to identify the cause of the [[heart failure]]:
**Renal function tests including [[urinalysis]] and [[Electrolyte|electrolytes]]
**[[Complete blood count]]
**[[Thyroid]] studies in patients being treated with concomitant therapy such as [[amiodarone]]
*Biomarkers:
**[[BNP]] or [[NT-proBNP]]<ref name="pmid23747642">{{cite journal |vauthors=Yancy CW, Jessup M, Bozkurt B, Butler J, Casey DE, Drazner MH, Fonarow GC, Geraci SA, Horwich T, Januzzi JL, Johnson MR, Kasper EK, Levy WC, Masoudi FA, McBride PE, McMurray JJ, Mitchell JE, Peterson PN, Riegel B, Sam F, Stevenson LW, Tang WH, Tsai EJ, Wilkoff BL |title=2013 ACCF/AHA guideline for the management of heart failure: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines |journal=J. Am. Coll. Cardiol. |volume=62 |issue=16 |pages=e147–239 |year=2013 |pmid=23747642 |doi=10.1016/j.jacc.2013.05.019 |url=}}</ref>
**Cardiac Troponin T or I
**Carbohydrate Antigen 125<ref name="pmid27810078">{{cite journal| author=D'Aloia A, Vizzardi E, Metra M| title=Can Carbohydrate Antigen-125 Be a New Biomarker to Guide Heart Failure Treatment?: The CHANCE-HF Trial. | journal=JACC Heart Fail | year= 2016 | volume= 4 | issue= 11 | pages= 844-846 | pmid=27810078 | doi=10.1016/j.jchf.2016.09.001 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=27810078  }} </ref>
|
* EKG to detect underlying cause
* Chest x ray shows cardiomegaly
* Echocardiography is done:
** To determine [[stroke volume]]
** To assess type of heart failure<ref name="pmid19700135">{{cite journal |vauthors=Agha SA, Kalogeropoulos AP, Shih J, Georgiopoulou VV, Giamouzis G, Anarado P, Mangalat D, Hussain I, Book W, Laskar S, Smith AL, Martin R, Butler J |title=Echocardiography and risk prediction in advanced heart failure: incremental value over clinical markers |journal=J. Card. Fail. |volume=15 |issue=7 |pages=586–92 |year=2009 |pmid=19700135 |doi=10.1016/j.cardfail.2009.03.002 |url=}}</ref>
|}
 
*Pertussis must be differentiated from other causes of cough, dyspnea, and coryza, such as:<ref name="cdcPertussis">{{cite web |url=http://www.cdc.gov/pertussis/about/signs-symptoms.html |title=Pertussis &#124; Whooping Cough &#124; Signs and Symptoms &#124; CDC |format= |work= |accessdate=}}</ref>
*[[Asthma]]
*[[Pneumonia]] (typical or atypical)
*[[Influenza]]
*[[Bronchiolitis]] (e.g. [[RSV infection]])
*[[Chlamydia]]
*[[Common cold]] (e.g. [[rhinovirus infection]])
*[[Croup]]
*[[Foreign body aspiration]]
*[[Gastroesophageal reflux disease]]
*[[Sinusitis]] ([[allergic sinusitis|allergic]] or [[infectious sinusitis|infectious]])
*[[Tuberculosis]]
*[[Cystic fibrosis]]
*[[Interstitial pneumonitis]]


==References==
==References==
{{reflist|2}}
{{reflist|2}}
[[Category:Disease]]
[[Category:Bacterial diseases]]
[[Category:Pediatrics]]
[[Category:Infectious diseases]]
[[Category:Emergency medicine]]
[[Category:Pulmonology]]
[[Category:Needs overview]]
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{{WS}}

Latest revision as of 15:52, 28 July 2017


Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Yazan Daaboul, M.D.; Serge Korjian M.D.; Aditya Govindavarjhulla, M.B.B.S. [2]; Luke Rusowicz-Orazem, B.S.

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Overview

Pertussis must be differentiated from other causes of cough, dyspnea, and coryza, such as asthma, pneumonia, bronchiolitis, croup, common cold, cystic fibrosis, foreign body aspiration, gastroesophageal reflux disease, and sinusitis.

Differentiating Pertussis from other diseases

Diseases Symptoms Signs Diagosis
Fever Cough Chest pain Wheezes Crackles Tachycardia Lab tests Imaging
Pertussis + Dry - - -
  • No remarkable imaging findings
Asthma - Dry/Productive - + - -
Bronchiolitis +/- Dry - + + +/-
COPD + Productive - + + +
Bacterial pneumonia + Productive + + + +/-
Pulmonary embolism +/- Bloody + + + +
Diffuse idiopathic pulmonary neuroendocrine cell hyperplasia[11] - Dry - + - -
  • Pulmonary function test shows obstructive lung disease
Tuberculosis + Bloody + - - -
  • Sputum culture:
    • Three successive positive culture for M. tuberculosis confirms the diagnosis[12]
    • Presence of acid fast bacilli in sputum smear indicates high extent tuberculosis
  • CT scan may show:[14]
  • EKG may have abnormalities in case pleural effussion associated with TB.
Interstitial pneumonitis (Hamman - Rich syndrome) + Productive - - + -
Foreign body aspiration + Bloody + + - -
  • Chest X ray shows:
Congestive heart failure - Dry/Productive + while walking - - +
  • EKG to detect underlying cause
  • Chest x ray shows cardiomegaly
  • Echocardiography is done:

References

  1. Liu WY, Yu Q, Yue HM, Zhang JB, Li L, Wang XY; et al. (2016). "[The distribution characteristics of etiology of chronic cough in Lanzhou]". Zhonghua Jie He He Hu Xi Za Zhi. 39 (5): 362–7. doi:10.3760/cma.j.issn.1001-0939.2016.05.006. PMID 27180590.
  2. Lin L, Chen Z, Cao Y, Sun G (2017). "Normal saline solution nasal-pharyngeal irrigation improves chronic cough associated with allergic rhinitis". Am J Rhinol Allergy. 31 (2): 96–104. doi:10.2500/ajra.2017.31.4418. PMID 28452705.
  3. Jiang S, Li J, Zeng Q, Liang J (2017). "Pulmonary artery intimal sarcoma misdiagnosed as pulmonary embolism: A case report". Oncol Lett. 13 (4): 2713–2716. doi:10.3892/ol.2017.5775. PMC 5403205. PMID 28454456.
  4. Mosley JD, Shaffer CM, Van Driest SL, Weeke PE, Wells QS, Karnes JH; et al. (2016). "A genome-wide association study identifies variants in KCNIP4 associated with ACE inhibitor-induced cough". Pharmacogenomics J. 16 (3): 231–7. doi:10.1038/tpj.2015.51. PMC 4713364. PMID 26169577.
  5. Environmental Triggers of Asthma. Differential Diagnosis of Asthma. Environmental Health and Medicine Education. Agency for Toxic Substances and Disease Registry. Available at: http://www.atsdr.cdc.gov/csem/csem.asp?csem=32&po=5. Accessed on February 25, 2016
  6. Pertussis (whooping coug). Diagnosis confirmation. CDC.gov. Accessed on June 22, 2017
  7. Pertussis (whooping cough). Specimen collection. CDC.gov. Accessed on June 22, 2017
  8. Ghanei M, Tazelaar HD, Chilosi M, Harandi AA, Peyman M, Akbari HM; et al. (2008). "An international collaborative pathologic study of surgical lung biopsies from mustard gas-exposed patients". Respir Med. 102 (6): 825–30. doi:10.1016/j.rmed.2008.01.016. PMID 18339530.
  9. Lazović B, Svenda MZ, Mazić S, Stajić Z, Delić M (2013). "Analysis of electrocardiogram in chronic obstructive pulmonary disease patients". Med Pregl. 66 (3–4): 126–9. PMID 23653989.
  10. Cvitanic O, Marino PL (1989). "Improved use of arterial blood gas analysis in suspected pulmonary embolism". Chest. 95 (1): 48–51. PMID 2491801. Retrieved 2012-04-30. Unknown parameter |month= ignored (help)
  11. Nassar AA, Jaroszewski DE, Helmers RA, Colby TV, Patel BM, Mookadam F (2011). "Diffuse idiopathic pulmonary neuroendocrine cell hyperplasia: a systematic overview". Am J Respir Crit Care Med. 184 (1): 8–16. doi:10.1164/rccm.201010-1685PP. PMID 21471097.
  12. Drobniewski F, Caws M, Gibson A, Young D (2003). "Modern laboratory diagnosis of tuberculosis". Lancet Infect Dis. 3 (3): 141–7. PMID 12614730.
  13. Riccardo Piccazzo, Francesco Paparo & Giacomo Garlaschi (2014). "Diagnostic accuracy of chest radiography for the diagnosis of tuberculosis (TB) and its role in the detection of latent TB infection: a systematic review". The Journal of rheumatology. Supplement. 91: 32–40. doi:10.3899/jrheum.140100. PMID 24788998. Unknown parameter |month= ignored (help)
  14. Jeong Min Ko, Hyun Jin Park & Chi Hong Kim (2014). "Pulmonary Changes of Pleural Tuberculosis: Up-to-Date CT Imaging". Chest. doi:10.1378/chest.14-0196. PMID 25086249. Unknown parameter |month= ignored (help)
  15. Yancy CW, Jessup M, Bozkurt B, Butler J, Casey DE, Drazner MH, Fonarow GC, Geraci SA, Horwich T, Januzzi JL, Johnson MR, Kasper EK, Levy WC, Masoudi FA, McBride PE, McMurray JJ, Mitchell JE, Peterson PN, Riegel B, Sam F, Stevenson LW, Tang WH, Tsai EJ, Wilkoff BL (2013). "2013 ACCF/AHA guideline for the management of heart failure: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines". J. Am. Coll. Cardiol. 62 (16): e147–239. doi:10.1016/j.jacc.2013.05.019. PMID 23747642.
  16. D'Aloia A, Vizzardi E, Metra M (2016). "Can Carbohydrate Antigen-125 Be a New Biomarker to Guide Heart Failure Treatment?: The CHANCE-HF Trial". JACC Heart Fail. 4 (11): 844–846. doi:10.1016/j.jchf.2016.09.001. PMID 27810078.
  17. Agha SA, Kalogeropoulos AP, Shih J, Georgiopoulou VV, Giamouzis G, Anarado P, Mangalat D, Hussain I, Book W, Laskar S, Smith AL, Martin R, Butler J (2009). "Echocardiography and risk prediction in advanced heart failure: incremental value over clinical markers". J. Card. Fail. 15 (7): 586–92. doi:10.1016/j.cardfail.2009.03.002. PMID 19700135.
  18. "Pertussis | Whooping Cough | Signs and Symptoms | CDC".

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